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    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
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    <script>
        //创建一个symbol
        let s =Symbol();
        //console.log(s,typeof s)
        let s2=Symbol('fuck')
        let s3=Symbol('fcuk')
        //s2==s3 false
        //symbol.for创建
        let s4=Symbol.for('fuck');
        let s5=Symbol.for('fuck');
        //s4==s5  ture

        //无法进行运算
        
    </script>
</body>
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